BBR安装时出现Error: Install elrepo failed, please check it.

今天在安装BBR的时候出现如下图的报错信息：

出现这种情况是由于系统源失效，或者太旧了的缘故，更新下系统即可。
---------------------------报错信息---------------------------
curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s).
error: https://www.elrepo.org/RPM-GPG-KEY-elrepo.org: import read failed(2).
curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s).
error: skipping https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm - transfer failed
Retrieving https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
Error: Install elrepo failed, please check it.

---------------------------处理办法---------------------------
yum update